Meeting each other for the first time, there will be clashes, enemies will be made - but so will the very best of friendships be forged.

Teaching adults a thing or two about bonding - and how 'the rolling disease' is the most fun you can have this year - this heartwarming footage shows three pairs of BFFs interact and become as thick as thieves.

But as this video shows, the path to true friendship does not always run smoothly, and as fun as their time is together, these little tykes must face the ultimate sorrow - having to say good-bye.

Theo and Tyler

Changing tack, Theo adopts a more unorthodox approach, and employs the use of a hula-hoop to get Tyler's attention - a measure which is cute when you're small, but frowned upon if done as an adult.

Aaah! By the end, Theo and Tyler are inseparable

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But it all pays off, as the video skips to footage of the boys looking for strawberries, culminating in the two sharing a hug and saying "I love you".

Alfie and Emily

A modern-day love story (but without the game-playing and neuroses), Alfie and Emily are as thick as thieves from the start.

In fact, adorable Alfie can't get enough of his new friend, always finding a spare moment to give her kiss, which Emily takes graciously in her stride, exclaiming at one point: "It's the fourth time he's done that!"

We also have this pair to thank for 'the rolling disease', a game which proves you don't need gadgets and complicated instructions to have fun.

Alfie only has eyes for Emily

Beatrice and Elvin

"Welcome aboard the South Eastern service to Nunhead!"

Exclaimed by Elvin while playing on a climbing frame, this ice-breaker works particularly well because of how hilarious this part of south London sounds.

Elvin and Beatrice quickly form a bond, cemented by a mutual love of Minecraft, and read out wonderful letters to each other at the end of their time together, with kind-hearted Elvin promising his best pal a sea shell.

Beatrice and Elvin share a love of Minecraft

This time, the action unfolds under the watchful eyes of three scientists, Professor Paul Howard-Jones, Dr Sam Wass and Dr Elizabeth Kilbey .

At any one time, two of the three are present throughout and filmed in situ as they observe and comment on the development of key social skills, such as emotional regulation, empathy and morality, in what promises to be a fascinating new series.

"I think it’s the purest thing I've ever seen,” says Dr Kilbey. "There is something just magical about being party to those little encounters between children. It’s as beautiful as it gets."

The series has been supported by The Wellcome Trust, who worked with the production company on its development to help make the science and scientists an integral part of the format.

Their funding support also enabled the production company to spend more time exploring the areas of science of interest to audiences and to include this within a collection of short online films which support the main series.